In the place of Shikizakura (cherry trees), where autumn leaves and cherry blossoms are flourishing and where human world intersects with the demon world, a ritual to save the human world is about to begin.
Kakeru Miwa, a high school student, gets involved in a battle between powered suits and oni that emerge from the demon world to prey on Onis manifest themselves in this world by possessing humans.
Only “Yoroi,” powered suit that is a fusion of ancient secrets and cutting-edge technology, can protect people from Onis.
Kakeru puts on a Yoroi(Ibara) by chance and becomes a semi-official member of a team that fights against Onis.
Determined to become a hero, Kakeru battles Onis to protect Ouka Myojin, the shrine maiden destined to save the world.